8: Factory new coding plug coded for my car with the correct size of tank.

When I connect any of those 3 fuel level senders I have bought, and move them to empty, then my fuel gauge shows 15 liters left, with NO low fuel light on, it is suppose to show all empty.

I have done a test where I connected all 3 fuel level senders one by one with the harness connector and moved them on around 3 liters instead of empty to see if it can show less than 15 liters, and turned ignition on. The Fuel Gauge then moves to 18 liters, which means that the gauge just adds the ekstra liters that the fuel level sender is on, I think that means that somehow my car thinks that 15 liters is empty, since my fuel gauge is on 15 liters when I run dry, but for what reason???